Who invented the Internet?

Advanced Research Project Agency develops the Internet.

In 1963, Advanced Research Project Agency(ARPA) unit,set up by us defense department,began to build a computer network.The reason behind this was the fear of nuclear threat by Soviet Union,it aimed to link computers at different locations,so the researchers could share data electronically without having fixed route between them which made their system less vulnerable to attack--even nuclear ones.

 The mechanism

       Schematic diagram by Larry roberts

Data was converted into telephone signals using a modem(Modulator-Demodulator),

Developed by AT&T in the late 1950s.In 1960s,key advances were made,including "packet switching" -- a system of packaging,labelling and routing data that enables it to be delivered across the network between machines.Paul baran proposed this system,which broke each message down into tiny chunks.This would be fired into the network,which would then route("switch")the various pieces to desired destination.so,if chunks of message were travelling for Seattle to New York via Dallas,but Dallas suddenly went offline,the network would automatically route via Denver instead.Different parts-"packets"-of a message would go by different routes,before being reassembled into original message at their destination,even if they arrived in wrong order.

When it was introduced publicly?

Paul baran published his concept in 1964,and five years later the new network --called ARPANET--went live.
As the threat of Nuclear war was receded in the early 1970s ,ARPANET was renamed as Internet and was effectively opened to all users.since then the development of e-mail,WWW(World wide Web),and browsing technology has enabled the Internet to to become a rich communications facility.


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